Numerical Investigation of Acoustic Emission Events of Argillaceous Sandstones under Confining Pressure

Figure 9

Deviatoric stress and ratio of cumulative events during confined compression test. (a) 0.5 MPa; (b) 2.0 MPa; (c) 4.0 MPa; (d) 6.0 MPa.

(a)

(b)

(c)

(d)